Circuit-controlling system.



,J. H. HALL. CIRCUIT CONTROLLING SYSTEM. 1 APFLIGATION'TILEX) NOV. 23, 1910.

1 0 Patented Aug. 22, 1911.

I Z SHEETS-'SHEET I.

llvimon J. H. HALL.

mom CONTROLLING sys'rnm. I

APPLICATION FILED NOV. 23, 1910. v

Patented Aug. 22, 1911.

2 SHEETS-SHEET I.

mmssss MENTOR UNITED STATES PATENT OFFICE.

JAY HALL, OF CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRIC CONTROLLER AND MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

CIRCUIT-CONTROLLING SYSTEM.

Specification of Letters Patent.

Patented Aug. 22', 1911.

Application tile-ti November 23, 1910. Serial No. 593,800.

To all whom it may concern:

of which the following is a specification.

My invention relates to circuit controlling systems, particularly that typein which the use of one or more magnetically operated switches is involved.

The object of my invention is to provide protection for a motor or other translating device in a circuit against an overload, and

to provide means for preventing the restart ing of such motor or device upon a failure of current and the consequent return of the same with all of the starting resistance cut out, these results to be obtained without the use of auxiliary contacts on the magnetic switches.

Referring to the accompanying drawings, Figure 1 shows diagrammatically my invention in connection with a manually-operated starting controller, or master switch. Fig. 2 shows my invention adapted to areversing controller with magnetically'opcrated resist ance switches;

Referring first to Fig. 1, C is a manuallyoperated master-switch having the arm 0 provided with the brush to bridge in its first operating position the fixed segments. or contacts, 0 and c Thesegmeut. c is connected to the positive wire 71, and the segment c" to'one end of the starting resist'ance'R. c, a, c, and c" are segments connected successively to porti ns ofltlie rcsista'nce The remaining end of the resistance R is connected to the negative wire n through the armature A, the winding 7. of the overload relay K. and the fixed contacts 8' of the switch S. The wire 1 leads from the segment a through the windings of the switch S to the point 0. to which twoother wires are connected, one leading through the resistance 0. thc'contacts l" and k of the relay K. and the wire 2 to the negative wire n. and theothcr through the resistance 7) and the wire 3 to the segment- 0 which hes parallel to the segment r" and extends from the segment 1'' to the segment c". The shunt field is connected to the wires 77 .and 2, that is. directly across the line.

The connectionsare such that to operate the switch the resistance a is connected in series with the winding 8, and to prevent the operation of the switch the resistance 'b is connected in parallel with the winding 8. These resistances a-re'so proportioned that if the winding 3 is connected across, the source of supply in series with the resistance a, the switch will operate, and if the resistance 6 is connected In parallel with the winding 5 and thisparallel circuit is connected across the source of'supply in series with the resistance a, the switch 5 will not operate, but after it. has once been closed it will remain closed with the connections thus arranged, due totiie' suialler air gap in the magnetic circuit, thus requiring a smaller amount of current in the winding 8 to hold the switch closed than to operate it.

The operation of the system shown on Fig. 1 is as follows: When the arm 0 is moved to the first position, connectingthe segments 0 and c, a circuit isesta'blishedfrom the positive wire 2 through segmentsc and 0,

the wire 1, the winding 8 of the switch S,

the resistance a, the contacts 1:, k ofoverload de ice K, and the wire 2, to the negative wire n. This causes the switch S to close its contacts '8, s causing a motor circuit to be established through the resistance R, the armature A, the winding-k of the overload device K, and the contacts 8, a of the switch S. On further movement of the arm a to the right, the starting resistance R is gradually cut out until the last position at o is reached, atwhich place the motor armature A is connected dire tly across the line and operates atits normal speed. As soon, how-' ever,-as the brush a has moved ofl of the first position, it comes in contact with the segment 0, and a circuit is established from the positive wire p through the wit-e13, the;

resistance 7), to a point. 0 between the winding s and the resistance a, thence throu h the resistance (r, the contacts k, k of t e overload device K. and the wire 2 to the negative wire a. This places the resistance 7) in a parallel circuit with the winding 8,- theparallel circuits both being in series with the resistance a. which causes a. smaller amount of current. to flow through the winding 8 due to the increased current through the resistance a, causing a correspondingly greater drop in potential between the nega-;

.tive source of supply and the bottom "erminal of the winding .9. This reduced current v. hasthe effect of reducing the heating oft-he allows theswitch S to remain closed, and

winding 8.. If an overload now occl'irs causing the motor to take a current larger than it can safely stand, the overloaddevice K.

opens its contacts, cutting off the current from the winding s'and causing the switch.

S to open. The overload device K immediately closes its contacts again, but the current which. now flows through. the winding 8, due to its being shunted by the resistance -b, will prevent the closure of the switch S until the handle of the controller is moved hack to the first position, at which place all of the starting resistance R is inserted. in the circuit.- hefore the motor can be restarted.

'' i lhwvhile the controller. handle is in the full running position, the voltage on the circuit.

. should fail for any reason, such as the opening of the circuit breakers in the power house, the switch S will open, and upon the return of current to the line the switch S will not close, since its winding .9 is shunted by the resistance b. To restart the motor it willbe necessaryfor the controller arm 0 tobe'moved baekto the position in which all the resistance R is inserted in circuit therewith.

Fig. 2- shows reversing controller for a series wound motor, with the armature A fland the fieldF in which all the switches 'llfar e magnetically operated and cont-rolled by 'ance a the point 0, the wire 8, contacts of the overload deviceK, the wire 9, the.w1ndt act s" M? and M" to the negative, which- 1 causes the switch 11" to close the motor c1r- 'M to the negative. "reversing switch 5. Upon moving the master'controller to position 2, a circuit 1s estab-- ing 5 of the switch 5, the contacts M and This circuit closes the lished from the positive .wire 7) through the wire 7, the'resistance J; the w1re4, the winding'fl of the switch-11,- and the concuit with all the starting resistances R, R

" a-rid R in series Withthe armature A and the field F; As the controller arm is moved to *"thefpositions 3, 4, and 5, the switches 12-, 13,

and 14: close successively, cutting out the res'istances RQR and R in succession, until.

-finally, the motor is connected directly across the source of supply. The windings 12, 13

iand 14 obtain their positive connection through the wires and 15 and through the auxiliary contacts of the reversing switch "5" or 6. As soon as'the switch-l1 closes, the fi resistance J; .is connected. in parallel with :the windings-5 and 11., the parallel. circuits being in series-with the resistance a. and the On moving thetroller is in any of the running positions, an

overload should occur, causing the overload device K to open its contacts, current will be cut of? from. the winding 5 causing the switch 5 to open, but the switch 11 remainsclosed, since its winding is still excited. Uponthe closure of the contacts of the overload device K, the small amount of current which now flows through the winding 5 will 1 not cause the reversing switch to close, and the motor will not-be restarted until the master controller arm is moved back to the position- 1. v If, while the master controller urc of voltage occurs, all of the switches will open and cut off current from the motor. The winding 11. may beso proportioned that it will cause suflicient current to flow through the resistance a to prevent suflicie'nt current flowing through the winding 5 to close the switch 5 upon the return of the voltage to the line. This would cause the switch 11 to. close, but no motor current would flow. The resistance 6 would then be connected in parallel Withthe windings 1.1 and 5, thus reducing thecurrent in both of the above windings, protecting them from overheating. I'n order.,'to restart t-he motor,

the'master controller arm-m mustbe moved baclrto the position 1 in order that all the starting resistances R, BER? may be inserted and gradually cutfout in bringing the mothe windings 11*? and 5, thuspreventing the reversing switch 5 fromclosing; The same descriptlon applies when the master cont-rol- -ler is l'IlOVeCl to the opposite side 'eitcept'that reversing switch 6 will close instead of the reversing switch 5, and-the armature'c'onnect onswill be reversed,caus1ng the motor to run Tnt'he opposite direct-ion. I cl-aimi 1.-. In an electric controller, a resistance, a magnetically-foperated switch, means for connecting the winding of the'switch to a source of supply in series'with the resistance, and a shunt a-round the-Winding,=the shunt i'ncluding the said meansand controlling the current in the winding.

3. In an electric controller, a resistance, a

.inagneticall v-o1')erated main switch, a mast-er switch for connecting thewinding of the main sw tch in series with t-heresistanbeand a shunt around the .Windlng, the shunt ineluding contacts on the mastenswitch and, Windings 5* and 1.1 have their current thereby reduced, but not sufliciently to cause the SWllQl1P.StO open. If, while the master concontrolling, the current in the winding.

In an electric controller. a. resistan ce.-a

magnetically operated mainswitch, means arm is in any, of the running positions a fail-v for connecting the winding of the switch in series with the resistance,-a second inagnetically-operated switch, means for "subsequently connecting the winding of the second switch in parallel with the winding of the first switch and in series with the said resistance.

4. In an electric controller, a resistance, a magnetically-operated main switch, a wind ing therefor, a master switch for connectingthe Winding-to a source of supply in series with the resistance, and a second magnetically-operated switch, having its winding arranged to be connected in parallel with the first winding so that the current in the first winding will not be large enough to operate the main switch, the winding of the second switch being connected in series with the said resistance. I

In anelectric controller, aresistance, a magnetically-operated switch having its winding connected to a source of supply with the resistance in series'therewith, a second resistance, a second switch which when closed causes the second resistance to be connected in shunt with the winding of the first switch, and means for connecting the winding of the second switch as a. shunt around the winding of the first switch and in sericswith the said first resistance.

(i. In a motor control system, a resistance, I

a .main switch and a resistance switch, a master switch connecting the winding of the switches in parallel to, a source of supply and in series with the saidxrcsistance, and means for opei'iing the circuit of the main switch when-the motor current exceedsa predetermined *alue.

T. In a motor control HySttlIl tl' resistance, two magnetically-operated switches, means connecting their windings in parallel branches. thcparallel ln-anches'heing in se-' ries with the rcsistam-e,-and means respon- .sivc to the motor current for opening the pa 'allcl hranch containing one of the windings.

8. In an electric controller, a resistance,

a circuit, two switches connected thereto,

means connecting the windings of the switches in parallel to asource of supply in scrics with the resistance, and means for reducing the current in. one of the windings when the current in the circuit is larger than 'a prcdctcrmincd valve.

t). In an electric controller. two resistanccs. a circuit. a switch therein lnwing an opcrating-winding. the whaling and the two resistances having a common connection,

meansconuccting the winding and one of ,t-hc'rcs stauccs to one side t a source of supply. the other resistance hcing com-icctcd to. the other side of the source of supply.

and means for opening the circuit of the winding when tl'ie current in the circuit hecomcs grcatcrth'an; a predcterminedxalue.

10. In a motor control system, a resistance, a switch, means connecting the winding of the switch to a source of supply in series with the resistance, a second switch which when closed causes a shunt to be connected around thewinding, means for opening'the circuit through the winding when the motor current exceeds a predetermined value without causing the second switch to open.

11. In an electric controller, a resistance, a circuit, a switch having contacts in the circuit. a master switch for connecting the winding of the switch to a source of supply in serieswith the resistance, a second resistance. means subsequently connecting the second resistance as a shunt around said winding. and means responsive to the current in the circuit for opening the circuit through the. winding. i

12. In a motor control system, a resistance, a magnetically-operated switch having contacts in the motor circuit, a master ance. and means including the said contacts of the switch for connecting a shunt around said winding when the switch is closed.

14; In an electric controller, a resistance, a main circuit. a magnetically -operated switch having contacts in the circuit, a second resistance. means connecting the operating winding of the switch and the res stance in parallel circuits, and in series with the second resistance. an'overload device op eratii'c. when-the current in said main circuit exceeds a..predcterinined value. to decrease the current flowing in the parallel circuit containing the winding. r

1,5. Inan electric controller. a resistance, a main circuit,' a magnetically operated switch having contacts in the circuit, means connecting the winding of the switch to a source'of supply in series with the resistance to ,operate the switch, means connecting a. shunt around the winding. and means refor o )enin v the circuit of the win'din when the current in the main circuit exceeds a predetermined value.

. 16. In acircuit controlling system. a resistance. a switch. an operating winding therefor. means connecting said winding and the resistance in parallelcircuits. a second resistance. means connecting the parallel circuits in series. with the sccohdresistance, and means for opening the branch containing the Winding when the current revel-set, and IiiQAllStOI' opening the circuit 10 through the contacts of the switch exceeds containing the \\-'i1'n1ing'Wl'1en the Current in a predetermined value. the motor is above a predetermined value.

17. In a motor control system, a resist-- Signed at Cleveland, Ohio, this 9th day 5 ance, a reverser, an operating Winding thereof November. A. l). 1910. for, means for connecting the Winding in JAY H. HALL. series with a resistance to operate the re Verser, means for connecting a shunt around the winding to prevent the operation of the Witnesses R. H. BENNETT, H. M. DiEMER. 

